Follow a request to its template
Start with the URL that gives an unexpected result. Check its hostname: Zotonic uses it to select a site before matching the site's dispatch rules.
Run bin/zotonic dispatch garden /welcome. Read the selected dispatch name, controller, and arguments. A template controller renders its configured template. A page controller also works with a content resource, often available as id in the template.
Next, inspect the active template selected for that name. Includes and category variants can select additional files from other active modules. Use Find the template used by a page to find those files. Test the actual browser request too: dispatch inspection does not reproduce every authentication, language, or response condition.